Clinker-grinder.



L. JOHNSON.

CLINKER GRINDER.

APPLICATION FILED MAR. 3. I916.

1,234,904. Patented July 31, 1917.

fizyeiarx by [68768 Ja/Zmswz LANE JOHNSON, on KOKOMO, INDIANA.

CLINKER-GRINDER.

Specification of Letters Patent.

Patented July 31, 1917.

Original application filed November 2, 1915, Serial No. 59,200. Divided and this application filed March 3, 1916. Serial No. 81,866.

To all whom it may concern Be it known that 1, LANE JOHNSON, a c1t1- zen of the United States, and resident of Kokomo, county of Howard, and State of Indiana, have invented certain new and useful Improvements in clinker-Grinders, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention relates to furnaces and has been divided out of my application for patent on mechanical stoker, Ser1al No. 59,200, filed November 2, 1915. The object of, the invention is to provide an improved form of clinker grinder for efiecting a regulated discharge of the ash from mechanically fired furnaces. The invention accordingly contemplates a set of cooperating grinding rolls and shafts for supporting the same, the feature of improvement residing more especially in a construction and arrangement of the parts which greatly reduce the tendency to distortion upon exposure to heat from one side.

In the accompanying drawings, Figure 1 is a detail plan sectional view of a steam boiler furnace equipped with the improved clinker grinder, the parts of the clinker grinder being principally shown in lan p Fig. 2 is a detail transverse sectional view of the furnace shown in Fig. 1, and

Figs. 3 and 4 are detail plan views, partly in section, showing two slightly different forms of construction. V

The improved clinker grinder will usually be associated with a mechanically fired steam boiler furnace of the so-called underfeed type. The drawings show one side of the fire box of such a furnace at 10, there being a laterally sloping fuel gate at 11 and a central fuel hopper at 12. The furnace also has a central air supply chamber 13, below the grate, as 11, and an ash pit chamber 14 at each side, only one of the said ash pit chambers being shown. The lower edge of the sloping grate 11 is spaced apart from the adjacent side wall, as 16, of the fire box. An opening or throat 17 which extends from front to rear of the fire box and communicates with the corresponding ash pit chamber 1 1 is thus provided at each side of the furnace.- When this form of construction is used a solid longitudinal partition 15 preferably extends from the floor of the air supply and ash pit chambers 13, 14 to the lower edge of the grate 11 for confiningthe air supply to the under side of the grates.

The improved clinker grinder preferably comprises a plurality of short rolls 18, arranged in two cooperating sets, as 19 and 20. These two sets of rolls extend horizontally through the throat 17 from front to rear, the rolls 18 of each set being sleeved upon a shaft, as 21 and 22. which is entirely independent of the masonry walls, as 16, of the furnace is provided, if a cast iron frame, generally designated 23,-is employed for supporting the parts. As shown, this frame comprises the partition 15, a side wall plate 24: and front and rear end plates 25 and 26. When the fire box 10 is of considerable length, the frame 23 may also include a pair of transverse intermediate tie plates, as 27 and 28. There is also a front wall plate 29.

The shafts 21 and 22 are preferably of stout construction and substantially square in cross section with rounded corners, as 30,

A construction the openings through the rolls 18. being of substantially the same shape in cross section so that the rolls are rotated by the turning of the shafts. Each shaft 21, 22, is journaled at its rear end in the rear end plate 26 and extends forwardly therefrom through the tie plates 28 and 27, through the front end plate 25 of the frame 23 and into a gear box 31 which is secured against the front wall plate 29 upon the outside. Each of the end plates 25, 26 and the two tie plates 27 and 28 accordingly have round openings, as 32, (Fig. 2), to provide bearings for the shafts. As the two sets 19 and 20 of rolls 18 are to rotate in opposite directions, intermeshing gears 33 and 34 are mounted upon the forward ends of the shafts 21 and 22 within the gear box 31. Any convenient mechanism may be employed for actuating the rolls. In the arrangement shown, a pinion 35 is engaged with the gear 33 and a pawl arm 36 cooperates with a ratchet wheel 37 which is mounted upon the forward end of the spindle of this pinion.

While all of the rolls 18 haveastep by step rotating movement during the operation of the furnace the rate of this movement will usually be very slow. While all of the rotatupon their two sides is prevented if the surfacen'iaterial of each shaft is interrupted at intervals throughout its length, as by the provisio'nof a series of peripheral grooves 38 or 39 in each shaft. These grooves permlt the expansion of the surface material of the shaft along one side without increasing'the total length of the shaft at that side. In the 20 i the peripheral grooves 38 are located at the places where the shaft,as 21, is journaled in form of construction illustrated in Fig. 4:,

the frame members 25, 27 and 28.

In s'ome instances, as when the work accomplished bythe rolls 18 requires the transmission of a considerable amount of power,

provision lmay be made for preventing any relative twisting movement between adjacent sections of the shafts upon which the 'rolls are mounted. To this end the rolls of each set, as 19,may be sleeved upon a shaft 4E0 (Fig. 8), having the peripheral grooves '39 which are'so located that each roll 18 coversa portion of the shaft at each side of one of the said grooves. Under these circumstances the rolls 18 serve as couplings for rotatably connecting the parts of the shaft at opposite sides of the grooves. It follows that the grooves may be cut to any desired depth, as the adjacent sections of each shaft require no direct connection, I though such a connectlon may afford convenience in assembling the parts.

cdpis (if this patent nlay be obteinefl for independent of the shaft sections.

crushing rolls sieevefdn on the said periph- I claim as my invention,-

1. A clinker grinder element for furnaces comprising, in combination, a series of shaft sections extending in axial ahnenient, ad a-V cent sections being spaced apart at their peripheries to permit independent longitudinal or expansion of the peripheral portions of the sections, and a series of crushing rolls 7 sleeved upon the shaft sections with intervening spaces between adjacent rolls in the said series to permit independent longitudinal expansion of the several rolls. 7 V

2. A clinker grinder element for furnaces comprising, in combination, a seriesof shaft sections extending in axial alinement, adja- 7 cent sections being spaced apart'at their ps1 riph'e'ries to permit independentlongitudinal '60 expansion of the peripheral portions of the sections, and a series of crushing rolls slidingly mounted upon the shaft sections to permit longitudinal expansion of the rolls 3. A clinkergrinderelement for furnaces comprising, in combination, a pair of noncircular shaft sections extending in axial alinement, the adjacent ends of the twos'ec tions being spaced apart at theirperipheries,

and a crushing roll sleeved upon the 'two shaft sections and serving as a coupling for ro'tatably connectingthem V 4. A clinker grinder element for furnaces' comprising, in combination, a longitudinally continuous shaft core, a plurality of non-circula'r peripheral shaft sectio ns arranged .f along the said shaft core with their ends 3 spaced apart and afpluralityof separate eralshaft sections, eachlof said crushing. rolls being extended over parts of two adjacent peripheral shaft sections and each two adjacent crushing rolls covering parts of the same peripheral shaft section,

LANE JoHNsoN.

five cent s a eli, fby 'adiiressiiig the coiiiinis sioinerliif iatents, 7 Washington, I). O. 

